Art of briquetting



Feb. 16 1926.

P. C. MULLIGAN ARTOF BRIQUETTING Filed July 21 5 Sheets-Sheet l I l I W Paul a. MuHfydn \1 w'f Feb. 16 1926. 1,573,565

' P. C. MULLIGAN ART OF BRIQUETTING Filed July 21 1924 5 Sheets-Sheet 2 Pau; amalgam" -PC Feb. 16 1926.

P. C. MULLIGAN ART OF BRIQUETTING 5 Sheets-Sheet 5 Filed July 21 1924 gnue'vltom Paul a Mulligan 1,573,5 5 P. c. MULLIGAN ART OF BRIQUETTiNG Filed July 21, 1924 r 5 Sheets-Sheet} Feb. 16 1926.

Paul 'Mumya? Feb. 16 1926.

1,573,565 P. c. MULLIGAN ART OF BRIQUETTING Filed July 21 1924 5 Sheets-Sheet 5 I gnmnloq Paul G.M.uIZzyan 3% Gum- 4 Patented Feb. 16, 1926.

, cmrsn sums- PATENT OFFICE.

PAUL CJIVLULLIGAN, 0F SEATTLE, WASHINGTON, ASSIGNOR TO ESAAC M. FOSTER, AND LUTHER J, HULL, ALL OF SWALWELL,

, me'ron.

, 1 ART or BRIQUETTING.

HIMSELF, H R ERT e.

SEATTLE, wasn- Application filed July 21, I824. Serial No. 727,321.

To all whom it may concern:

Be itl tnown that L PAUL hiULL'IGAN, a citizen of the United States of America, and resident oi the city 01 Seattle, in the county of King and State of Washington, have invented certain new and useful Improvements in the Art of Briqu'etting, of which the following is a specification.

My invention relates to an improvement in the art of briquettingp and in one as poet is embodied in an improvedpress to! making briquettes. comprises an improved method of forming briquettes, especially by employing a plurality oit mold-forming members, one of which is a reciprocable ram, whereby the briquette after its formation under pressure, is retained under pressure notwithstanding the removal or retraction of-the until the initial 1 tendency reciprocable ram,

separate has of the particles to rebound and been overcome.

Commercial manufacture of briquettes from carbonized wood waste has heretofore one end of the device, lllustrating part1cubeen impracticable, owing to the tendency of the particles to separate, causingexpansion of the biiquette, immediate-ly'upon its -formation. My present invention is particularly intended for use in the practical, commercial manufacture of briquettes from such materials, although it willbe understood that it will operate with equal or greater success with less resilient materials.

it will be understood then, that it is an object of m invention to provide a method and 311821118 whereby briquettes when formed may be held under pressure for a time sufiicient to counteract the initial tendency to expand, and until the particles have set in their compressed relation.

A "further object is the provision of an improved press whereby briquettes may be conveniently, economically and rapidly manufactured.

rfurther object is the provision of improved feeding means for the briquette material, which will cooperate with the moldforming members.

A further object is the provision of a generally improved and simplified briquette press, and the provision therein of means for applying suilicient' pressure to, thema- In another aspect it I tei'ials, yet capable of being released or of relieving such pressure in. case of danger or overloading of the mold.

'My intention comprises the novel press and the combination of parts therein, and the novel method, all for forming briquettes, as shown in the accompanying drawings, described in'this specification, and particu-- larly defined by the claims terminating the same. v-

In the accompanying drawings I have shown, both diagrammatically and in detail-, a preferred form of the briquette press, by means of which my improved method may be carried out, the-diagram illustrating more particularly the cycle of operations comprising my method; I

.Figure. l is an elevation, -'ith parts broken away, of the leftlhandend of the press, and Figure 2 alike view-of the right hand end, with parts in the two views shown in the positions they would occupy at a selected in'stant'in the cycle of operation.

Figure 3' 1s a transversev section through larly the feeding means and operative connections between the two ends.-

Figure 4 is a horizontal section through one end'of the press, taken on the axis of the molds.

Figure 5 is a detail section similar to Figure 3, showing the feed mechanism in its advanced position. v v v Figures 6 7, 8 9 and 10 are diagrams, respectively indicating the successive steps in the cy'cleof operation oi the press.

According to my invention the briquette is. formed in a. mold which includes an openv ended mold sleeve 1, a ram 2, reciprocable in one end of said sleeve, and a head 3 which is adapted to close the open delivery end of the mold sleeve against pressure ments of the ram 2, the head 3 and the feeder 4, and 1 have found it possible to control these by means of two cams, the peripheral cam 22 controlling the ram 2 and the inte'nal cam 33 controlling the head 3. The feeder is indirectly controlled fr in one of these, as the cam 33, as will be apparent hereinafter.

It will be understood that the machine may be, and preferably is. formed of a plurality, perhaps two, angularly-spaced units, so that like molds are formed at opposite ends of the machine, and it will be understood also, that additional molds and asso ciated men'ibers are formed at each end, two being shown. The principle of operation however, will be understood by reference to a single mold only. and this cycle of operation has been illustrated in Figures 6-10 inclusive. By reference to hese figures, and first to Figure (3, it will be seen that the head 3 is stationary and closes the delivery end of the mold sleeve 1, retaining; in place therein the briquetto B, which had previously been formed. Although the ram 2 has been retracted to its full extent to uncover the feed aperture 10, the briquette B is retained in place in the delivery end of the mold sleeve, preferably by making this delivery end slightly expanded beyond the normal dian'ieter of the mold sleeve, or by slightly selling or flaring this end, as is in dicated at 11. Thus any tendency of the briquette to expand peripherally or longitudinally. acting upon the inclined surfaces of the delivery end 11, merely tends to force it outward. and this tendency is restrained by the then stationary head In the phase represented in Figure 6 the feeder has advanced to project loose materials into the mold sleeve 1, and has now closed the feed aperture 10. In so advancing the n'iaterials they are given an initial compression. The low point 22 of the cam 22 is contacted with by a follower 21 (Figures 1, 2 and 1:), and is about to advance the ram 2. The follower 31 (Figures 1, 2 and l) is engaging a like low spot of the cam 33, and is about to retract the head 3.

The next step is shown in Figure 7. Rid ing' over the rise 22 of the cam 22, the ram 2 has advanced, and riding over the rise 33" of the internal cam 33 the head 3 has been retracted simultaneously, and preferably by a slightly greater amount, until the briquette B has been forced forward by the advance of the material before the ram 2, and has dropped from the delivery end of the molt sleeve 1. In this action the fresh materials are given a second compression.

Following: this the concentric portion 22 of the cam 22 is reached, and he advance of the ram 2 is temporarily halted. However, by reason of the advance 83 of the cam 38, the head 3 is rapidly returned to its place in the delivery end 11 of the mold sleeve, while the advance of the ram is temporarily halted. It will be seen, then, that the head 3 is only removed from position in the end of the mold sleeve long enough to permit expulsion of the formed briquette, but, by reason of halting); of the ram, before any of the fresh material can be expelled. The end of this phase is shown in Figure 8.

Following this, and as seen in Figure 9, the head 3 is held in place by the concentric portion 33 of its control cam, whereas the ram 2 is now advanced through the medium of the rise 22 of the cam 22. The feeder at at this time is retracted. through means which will be described hereafter, and receives a fresh charge beneath it. he advance of the ram 2 gives the final compression to the new briquette B and advances it until it is entirely within the belied end 11 of the mold sleeve 1.

From this point on the cam 22 drops away rapidly at 22". thus permitt-in rapid retraction of the rain 2 while the head 316- mains in position. Reopening; of the feed opening 10 then occurs and as the feeder 4. is again advanced, this delivers a fresh; charge to the mold sleeve 1 and places the parts finally in the position shown first in Figure 6.

The diagrams, Figures 610 inclusive, represent elementarily, the steps which take place in my method, and represent in diagrammatic form, the parts of the machine which carry out such method. As I have stated above, I have found it most economical to employ a double-ended press with two or .more molds at each end. Such an arrangement is illustrated in Figures 1-5 inclusive. A pair of mold sleeves 1 are formed as bushings fitting: into a standard 1 1 forming part of the machine frame, and upon which the hopper 40 is likewise mounted. The rams 2 for each pair of mold sleeves likewise reciprocate in the standard 1 being controlled in its movement by the slide 20. which carries the cam follower 21 and which is guided for longitudinal movement by means of sleeves 23 formed upon the slide 20 and sliding upon the longitudinal guide rods 24:. Such guide rods are conveniently supported between and tie together the standards 1 1 at opposite ends of the machine it being understood that one such standard is positioned at each side of the central shaft 30 carrying the cams 22 and 83. The slides 20 at opposite sides of the shaft 30 are connected for simultaneous actuation by means of tie rods 25 passing through lugs 26 formed upon the slides 20. The slides are relatively yieldable longitudinally of the rods. the inner faces of the lugs being; engageable by collars or bump ers 27 fixed upon the rods 25 and springs 28 ram, for example,

being interposed between the ends of the rods 25 and the lugs 26'.

It. will be noted that. as the rams2 at one end of the machine are advancing into the mold sleeve, the rams at theoppositeend are being retracted, and this action is controlled through a, single peripheral cam 22 by means of the tie rods 25; Thus, as the I rams at i the left end, fonexam'plc, are being forced into the mold sleeve by means of the rise 22, the rams at the right'end arebeing re- 28' are employed, these permitting yielding longitudinally between the two slides 20, the

one at the right hand end being held by the concentric portion 22, while theram at the left hand end is being farther advanced .by therise 22. It will be noted also that the portion 22" is in fact cut away and for this portion of the movement of the left hand it is controlled wholly by rise of the right hand follower 21 along the rise 22", mot-ion being communicated through the tie rods 25. This cutting away of the portion 22 is merely to avoid the necessity for machining the same, inasmuch as there is no requirement that the follower 21 actually engage t-his portion of'the cam 22.

The actual head 3 is preferably formed as a hardened head which can be screwed or otherwise held by a slide 32 suitablysupported from the standards 14, although in effect the slide forms part of the head. Movement of the slide 32 is preferably controlled through "a toggle lever arrangement, the levers 5 being pivoted upon trunnions 35 at the sides of the slide 32, and being fulcrumed at 51' upon the end of the link 50, which in turn is pivoted at, 54 upon the standard 14. Movement of theflever 5 is initiated through a link 52 pivoted to the lever 5 at 53, the link '52 being moved by an arm 55. 'By making the link 52 adjustable in length, the throw of the heads is controlledas desired. r

The lever 55 is keyed to a transverse rock shaft 56, to which is also keyed an arm or v arms 57,. these being connected through links 58 to an arm 36 pivoted at 3'7 to aframe member-13 and this arm 36 carrying the cam follower 31. By this means movement of the cam follower over a rise such as 33* of the cam 83, will, through the connections described, break the toggle formed betWee-n'the pivots 3'5, 51 and 53, and will retract the slide 32 carrying theheads 3. It is preferred that the heads should not be -moved positively to a closure, as this would cause damage in the event of excess material or foreign matter becoming jammed in the delivery opening of the mold sleeve 1, and for that reason I have. provided counter-weights '59, adjustable along the 59 which are likewise keyed upon the shaft 56, which act when the follower 31 passes over the drop 33, to move the heads 8 toward the end of the mold sleeve. In the event of the heads meeting an obstruction, the movement of the eounterweights 59 is halted and the machine will' not am nor break.

Inasmuch as the movement at one end of the machine may be made to coincide with the movement of the heads 3 at the opposite end of the machine,I have found it convenient to connect these? two parts at opposite ends and thus operate the feeders from the samecam as the heads. To accomplish this, one of the arms 55 is provided with a second arm 45 which is con- 'nected through "a link 46. to an arm of a bell crank lever 47 which is :loose upon the shaft 56 at theopposite end of the machine.

of the feeder 4. y

Through a yieldable ball and socket con- ,nection', illustrated at 48,'the other arm of this bellcrank lever 47 is connected to thrust [links 49 which in turnactuate individual 1, and areformed to enter the feed aperture=10 in suchway as to prevent leakage therefrom while the ram 2 is moving through the mold sleeve. In this manner also the inner surface of the feeder is scrapedclean by the ram in its advance.

It will be'noted that serve only toraise or retract the feeder 4,v and in order to lower or advance them, that is to give an initial compression to fresh 'material' entering beneaththe feeder, I'employ preferably a 'coimterweight 6 upon an arm 64, pivoted to the shaft 56 and connected to the bellcranlr levers 42 by means of the links 68-. By such means, in case of foreign matter or other obstructions entering between the feeder and the edge of'the' mold sleeve, the downward movement of the counterweight to close the feeder- \vill beinterrupted, and though the bell crank lever the thrust links 4-9 1% 47 continue its movement, the yieldab-le con- 7 I nection at 48 Willgive and will thus prevent l breakage of the parts. s

In order to vary the throw of thefeeder,

some adjustable means may be provided, and

this is conveniently done at the connection between the arm 45 and link46. At this point, therefore, I may provide a pivot pin 41 secured between the two trunnions 44 which are eccentric to the pin 41 and which are received in theend of the arm45l The pin receivesthe endof the link 46. As the feeder.

arm 45 is a short one, and as the axis of the pin 41 is adjustable towards and from the pivot 56 of the arm 45, its throw is varied and consequently the throw of the mechanism following thereafter is also changed and to a considerable extent magnified.

In order to break the force of the slide 32 carrying the heads 3 as it moves open, and to start it immediately upon its return move ment, which must be rapid, I may provide a bumper '4', which is shown in the form of a bolt, projectible from a casing 71 toward the slide 32 by means of a spring 72. The amount of projection of the bolt 7 and also the tension upon the spring 72, may, of course, be adjusted, as by means of the nuts 73.

It is believed that it will be apparent from the above description that as material is fed into the hopper 410 it will drop to the bottom thereof, and after each upward movement of the feedert it will be caught thereby and the amounts forced into the mold sleeve 1 will be given an initial compression by the downward n'iovement of the Thereupon the rams at this end, actuated by the cam 22, will advance this material, again compressing it somewhat againstthe heads 3, and expelling a previously formed briquette, the head 3 being withdrawn by operation of the toggle connections described. After retraction of the rams the heads 3 will holdthe material, which has a tendency to rebound and expand, against the flared delivery end 11 of the mold sleeve, until this tendency has been overcome. This requires only an instant, for it is the initial rebound of the material, as the ram moves away, which tends to break up the briquet-te which has just been formed and which is not yet homogeneous. Movement of the heads at one end controls movement of the feeder at the opposite end, and the mechanism then goes through the same cycle, advancing a new charge into the mold sleeve and compressing it, expelling a previously formed briquette, and finally completing the compression of the new charge.

The mechanism is simple, two cams controlling the entire operation for both ends and for a plurality of molds and feeders. It is provided with means permitting yielding at the several points where damage may occur if the machine becomes clogged, and yet it is entirely positive in its action. The pressure applicable to the briquettes may be varied merely by shifting the counterweights upon their arms and the various dim nsions of the briquette may be varied somewhat and all parts of the machine adjusted to take care of wear and contingencies arising during the process of manufacture.

The drive connection, of course, is immaterial, but as shown herein it comprises a pair of large gears S to one of which the cam 33 is secured, these gears being keyed upon the shaft 30, and pinions 80 in mesh with the gears 8. Upon the shaft 81 to which the pinions 80 are keyed, is secured a gear 82 which in turn is driven froma pinion lhe latter is mounted upon a shaft 8% to which a pulley or other drive means may be secured. This gives a double reduction between the power source and the cam shaft 30, and provides ample power in the cams for the pressures required in forming the briquettes.

lVhat I claim as my invention is:

1. In a briquetting press, in combination with a mold sleeve, a head movable to close one end thereof, and a ram reciprocable in its other end, means for controlling the movements of said head and ram to advance charge before the ram to expel a previously formed briquette, then to close the delivery end of the sleeve with the head after expulsion of the said briquette and before in, ulsion of the said charge, then to advance the ram to complete the compression of the charge, then to withdraw the ram, and finally to withdraw the head as the ram begins its next advance.

2. In a briquetting press, in combination with a mold sleeve and a pair of opposed compression members cooperating to compress and expel a charge in said sleeve, means for controlling the movements of said compression members to advance one through the sleeve and sinmltaneously to withdraw the other from its delivery end, then to re turn the second member to close sai't delivery end, then to continue the advance of the first member towards the delivery end, and finally to retract said first member.

3. In a briquetting press, in combination with a mold sleeve having a feed aperture in its side and an open delivery end, a head movable to close said delivery end, a ram reciprocable in said mold sleeve past the feed aperture, a feeder movable to advance a charge through .said feed aperture and to close it, and means controlling the movements of said head, said ram, and said feeder to advance a charge before said ram towards tie delivery opening and simultaneously to withdraw said headto permit expulsion of a previously formed briquette, the feeder being maintained in position to close the feed aperture, then to return said head after expulsion of said briquette to close the delivery end, then to continue the advance of the ram to complete compression of the charge, the feeder being meanwhile retracted, and finally to retract said ram and advance the feeder with a fresh charge.

4. In a briquette press, in combination, mold forming members including a reciprocable ram, said members cooperating to compress a charge, and means for retaining the briquette thus formed under pressure prior to its release and after withdrawal of the ram. 1 r

5. In a briquet'te press, in combination,

a a plurality of mold-forming members ineluding a sleeve, a ram recipr-ocabletherein,

and a head movable to open or close the end of said sleeve opposite theram, said members cooperating to receive a charge, compress it, and expel the briquette after its formation, said sleeve being flared towards said head and Cooperating therewith to retain the briquette under pressure after its formation and prior to its expulsion.

6. In a briquette press, in "combination with a mold sleeve having a delivery end, a ram reciprocable therein to compress a charge and to expel a previously form-ed briquette, and a head movable to close or to open said delivery end of the sleeve, said 'p'anded delivery sleeve and head cooperating to maintain ,a

briquette in the sleeve 'under pressure after 7 .its formation and removal of the ram, and

before its expulsion;

7. In a briquette 'pness, in combination with a mold sleeve having a slightly exe'n-d, a ram reciprocable in the opposite end of the sleeve to compress a charge and to expel'a previously formed briquette, and a head" for .-'cl-osin g the delivery end during and" fora period after compression of the briquette;

v 8. The method of forming briquettes with a ram reciprocating within a mold which consistsin advancing the ram into the mold v to compress a chargegof material therein to form the briqiiette, and then maintaining the hriquette under pressure" for a period following retraction of the ram;

9.; In a br-quette press, in combination, two spaced setsef members eooperable to form a'mold, a single set of control means positioned between said setsofmold-form ing members, means connecting said control means with each of said sets of mold'formmg members to actuate alternate sets in one direction, and means connecting like parts in each set of mold-forming members to ac tirate each other alternately in the reverse direction, said latter means including a rods and the rams and yieldable to permit limited relative reciprocation of the rams, and operative connections between each head and the head-operating cam Y 11. Ina briquette press, in combination, a set of mold-forming members including a mold sleeve, aram reciprocable therein, and ahead adapted to open and'closelthe delivery end of said sleeve, two cams op- 'erable to control the ram and head, respectively, a'second set of mold-forming mem bers positioned beyond the cams from the first set, operative connections betweenone cam and each head to elfectpositive movement of the heads alternately away from the sleeve and permitting such movement at all times, yield-able means for moving each head towards the mold, and operative con nections between the other cam and said rams to reciprocate the latter. r 12. In a briquette press,

a set of mold-forming members including'a mold sleeve, a ram reciprocable therein, and a head adapted to open or close the delivery vend of said sleeve, two cams operable to control the ram and head, respectively, a feeder reciprocable to advance material into said mold, a second set of mold-forming members and a feeder therefor operable from said cams alternately with the first set, op-

erative connections between each head andthe head-operat1ng cam, operative connections between each ram and the ram-operat ng cam, a'nd'means operatively connectingthe head-operating means of each moldwith the feeder to the opposite mold.

121A briquette press asin claimdQ,

connections to the feeders includingameniber yleldable upon interruption of the advance movement of the-feeder 14. A briquette press as in {claim '12, the, connections to'-' the feeder-s including means in combination,

foradjusting the extent of movement thereof independently-of the movement of the corresponding head.

- 1 5. A briqnette press as in claim 12,-the

connectionsto the feeders includingfmeans for adjusting'the extreme positions in the path of movemen-tof the feeders independently of the movement of the corresponding head. I

16. In a footing positive movement of the head away briquette press, in combination, a mold sleeve, a head movable *to open or closethedelivery end'thereof, means for-ef- 1 fronifithe moldsleeve, and gravity-operated I means for moving said-headtowardsthe mold sleeve.

17.,Ina briquette press, in combination,

a mold sleeve, a head movableto open or close the delivery end thereof, a cam 0011- trolling-movement of said head,- operative connections between said cam head ,to

effect positive movement of the headaway from the sleeve and permitting such move ment at all times, and yieldable means for moving said head towards the mold sleeve.

18. In a briquette press, in combination, a frame member, a mold sleeve supported therein, a head movable to open or close the delivery end of said sleeve, a cam controlling movement of said head, a toggle lever pivoted by one end to said head, operative connection between its other end and said cam, and a link pivotally supporting sail lever between its ends from the frame member.

19. A device as in claim 18, the pivot of the toggle lever upon the head lying always at the same side of a line connecting the two pivots of the link, and yieldable means for moving said head towards the mold sleeve, the cam being operable only to move the head away from the sleeve.

20. In a briquette press, in combination, a frame member, a mold sleeve supported therein, a head movable to open or close the delivery end of said sleeve, a cam controlling movement of said head, a toggle lever pivoted by one end to said head, operative connection between its other end and said cam, a link pivotally supporting said lever between its ends from the frame member, and spring means positioned in the path of said head to check its movement away from the sleeve and to initiate its return move ment.

21. In a briquette press, in combination, a mold, a hopper thereabove and communicating therewith, a feeder reciprocable therein, means for positively retractin said feeder, and yieldable means for advancing the feeder.

22. In a briquette press, in combination, a mold, a hopper thereabove and communicating therewith, a feeder reciprocable therein, means for positively retracting said feeder, and a weighted arm operable to ad Vance the feeder.

28. In a briquette press, in combination, two molds spaced at opposite ends of the machine, a hopper above and communicating with each mold, a feeder reciprocable in each hopper, a transverse rock shaft adjacent each mold, cam means operatively connected to oscillate each rock shaft, a bellcrank lever loose upon each rock shaft and operatively connected to the adjacent feeder, and operative connection between each bellcrank lever and the rock shaft at the opposite end.

24. In a briquette press, in combination, two mold sleeves spaced at opposite ends of the machine, a hopper above and communieating with each mold, a head movable to cooperate with each mold sleeve in forming a mold, a feeder reciprocable in each hopper, a transverse rock shaft adjacent each mold, cam means operatively connected to oscillate each rock shaft, a lever loose upon each rock shaft and operatively connected to the adjacent feeder, means energized from each rock shaft to operate the adjacent head, and operative connection between each of said levers and the rock shaft at the opposite end.

25. In a briquette press, in combination,

two moldsleeves spaced at opposite ends of ie mac line a 10 361 a c a tl l 1 p1 bov nd communi eating with each mold, a head movable to cooperate with each mold sleeve in forming a mold, a feeder reciprocable in each hopper,

a transverse rock shaft adjacent each mold,

two mold sleeves spaced at opposite ends of the machine, a hopper above and communicating with each mold, a head movable to cooperate with each mold sleeve in forming a mold, a feeder reciprocable in each hopper, a transverse rock shaft adjacent each mold, cam means operatively connected to oscillate each rock shaft, a lever loose upon each rock shaft and operatively connected to the adjacent feeder, means energized from each rock shaft to operate the adjacent head in one direction, a weighted arm fixed upon each rock shaft to operate the corresponding head in the opposite direction, and operative connection'between each of said levers and the rock shaft at the opposite end.

27. In a briquette. press, in combination, two mold sleeves spaced at opposite ends of the machine, a hopper above and communicating with each mold, a head movable to cooperate with each mold sleeve in forming a mold, a feeder reciprocable in each hopper, a transverse rock shaft adjacent each mold, cam means operatively connected to oscillate each rock shaft, a lever loose upon each rock shaft and operatively connected to the adjacent feeder, means energized from each rock shaft to operate the adjacent head in one direction, said latter means including a connection yieldable under extraordinary stresses, a weighted arm fixed upon each rock shaft to operate the corresponding head in the opposite direction, and operative connection between each of said levers and the rock shaft at the opposite end.

28. In a briquette press, in combination, a mold sleeve having a side-opening feed aperture, a hopper leading thereto, a ram reciprocable in said sleeve past the feed aperture, a' feeder reciprocable in said hopper,

the advancing end of said feeder entering the said feed aperture and its face conforming to the inner periphery of the moldsleeve, and means controlling the movementof said r'eederand ram to maintain the former in advanced position until the ram has advanced therepast.

29. In a briquette press, a mold sleeve ghaving anopen delivery end, the axial bore thereof being formed toresist radial and backward pressures.

30. In a briquette press, a mold sleeve having an open delivery end, the axial bore of the sleeve at its delivery end being flared outwardly. r I

31. In a briq uette press, a mold sleeve having an open delivery end, the axial bore thereof being formed to resist radial and backward pressures, and means associated therewith for resisting outward pressures.

32. In a briquette press, a mold sleeve having an open delivery end, the axial bore thereof being formed to resist radial and backward pressures, means associated therewith forresisting outward pressures, and a ram movable through saidsleeve to advance sures, and removable therefrom.

34. In a briquette press, a mold sleeve having an open'dehvery end, the axial bore of the'sleeve at its delivery end being flared outwardly, a head movable towards the said delivery end to resist outward pressures, and removable therefrom, and a ram movable towards said head to advance material through the sleeve andto compress it within said flared delivery'end.

Signed at Seattle, King County, 'VVas h day-of June 1924. PAUL C. MULLIGAN,

ington, thisv 25th 

